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tcfail182.hs:9:3:
Couldn't match expected type ‘Prelude.Maybe a’
with actual type ‘Maybe t0’
NB: ‘Prelude.Maybe’
is defined in ‘GHC.Base’ in package ‘base-4.8.0.0’
‘Maybe’ is defined at tcfail182.hs:6:1-18
Relevant bindings include
f :: Prelude.Maybe a -> Int (bound at tcfail182.hs:9:1)
In the pattern: Foo
In an equation for ‘f’: f Foo = 3
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